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Soil surface plays an important role as interface between the atmosphere and the unsaturated zone, separating hydrologic processes into runoff and infiltration [1]. Soil's hydrologic functioning is defined by the structure of the access routes and of the spaces available for water movement and retention. This relation has a multitude of feedbacks that modify the function according to the changes in structure, and reversely [2]. Among the most important parameters linked to soil water state and dynamics are the hydraulic ones. The most important such properties are water retention in soil, the relation between the volumetric water content 6 and its potential h, the characteristics of hydraulic conductivity, and the relation